lhotari opened a new issue #13103:
URL: https://github.com/apache/pulsar/issues/13103
**Describe the bug**
SystemTopicBaseTxnBufferSnapshotService.close could hang forever.
Here's an example stacktrace from a test which was stuck:
```
java.lang.Thread.State: WAITING (parking)
at jdk.internal.misc.Unsafe.park([email protected]/Native Method)
- parking to wait for <0x00000000c9180010> (a
java.util.concurrent.CompletableFuture$Signaller)
at
java.util.concurrent.locks.LockSupport.park([email protected]/LockSupport.java:194)
at
java.util.concurrent.CompletableFuture$Signaller.block([email protected]/CompletableFuture.java:1796)
at
java.util.concurrent.ForkJoinPool.managedBlock([email protected]/ForkJoinPool.java:3128)
at
java.util.concurrent.CompletableFuture.waitingGet([email protected]/CompletableFuture.java:1823)
at
java.util.concurrent.CompletableFuture.get([email protected]/CompletableFuture.java:1998)
at
org.apache.pulsar.broker.systopic.SystemTopicClientBase.close(SystemTopicClientBase.java:100)
at
org.apache.pulsar.broker.service.SystemTopicBaseTxnBufferSnapshotService.close(SystemTopicBaseTxnBufferSnapshotService.java:83)
at
org.apache.pulsar.broker.PulsarService.closeAsync(PulsarService.java:451)
at
org.apache.pulsar.broker.PulsarService$MockitoMock$1941038334.closeAsync$accessor$2YWt8V2H(Unknown
Source)
at
org.apache.pulsar.broker.PulsarService$MockitoMock$1941038334$auxiliary$vnSPbJ8Z.call(Unknown
Source)
at
org.mockito.internal.invocation.RealMethod$FromCallable$1.call(RealMethod.java:40)
at
org.mockito.internal.invocation.RealMethod$FromBehavior.invoke(RealMethod.java:62)
at
org.mockito.internal.invocation.InterceptedInvocation.callRealMethod(InterceptedInvocation.java:141)
at
org.mockito.internal.stubbing.answers.CallsRealMethods.answer(CallsRealMethods.java:44)
at org.mockito.Answers.answer(Answers.java:98)
at
org.mockito.internal.handler.MockHandlerImpl.handle(MockHandlerImpl.java:106)
at
org.mockito.internal.handler.NullResultGuardian.handle(NullResultGuardian.java:29)
at
org.mockito.internal.handler.InvocationNotifierHandler.handle(InvocationNotifierHandler.java:33)
at
org.mockito.internal.creation.bytebuddy.MockMethodInterceptor.doIntercept(MockMethodInterceptor.java:82)
at
org.mockito.internal.creation.bytebuddy.MockMethodInterceptor.doIntercept(MockMethodInterceptor.java:56)
at
org.mockito.internal.creation.bytebuddy.MockMethodInterceptor$DispatcherDefaultingToRealMethod.interceptSuperCallable(MockMethodInterceptor.java:141)
at
org.apache.pulsar.broker.PulsarService$MockitoMock$1941038334.closeAsync(Unknown
Source)
at
org.apache.pulsar.broker.PulsarService.close(PulsarService.java:352)
at
org.apache.pulsar.broker.PulsarService$MockitoMock$1941038334.close$accessor$2YWt8V2H(Unknown
Source)
at
org.apache.pulsar.broker.PulsarService$MockitoMock$1941038334$auxiliary$scJJCpq9.call(Unknown
Source)
at
org.mockito.internal.invocation.RealMethod$FromCallable$1.call(RealMethod.java:40)
at
org.mockito.internal.invocation.RealMethod$FromBehavior.invoke(RealMethod.java:62)
at
org.mockito.internal.invocation.InterceptedInvocation.callRealMethod(InterceptedInvocation.java:141)
at
org.mockito.internal.stubbing.answers.CallsRealMethods.answer(CallsRealMethods.java:44)
at org.mockito.Answers.answer(Answers.java:98)
at
org.mockito.internal.handler.MockHandlerImpl.handle(MockHandlerImpl.java:106)
at
org.mockito.internal.handler.NullResultGuardian.handle(NullResultGuardian.java:29)
at
org.mockito.internal.handler.InvocationNotifierHandler.handle(InvocationNotifierHandler.java:33)
at
org.mockito.internal.creation.bytebuddy.MockMethodInterceptor.doIntercept(MockMethodInterceptor.java:82)
at
org.mockito.internal.creation.bytebuddy.MockMethodInterceptor.doIntercept(MockMethodInterceptor.java:56)
at
org.mockito.internal.creation.bytebuddy.MockMethodInterceptor$DispatcherDefaultingToRealMethod.interceptSuperCallable(MockMethodInterceptor.java:141)
at
org.apache.pulsar.broker.PulsarService$MockitoMock$1941038334.close(Unknown
Source)
at
org.apache.pulsar.broker.transaction.TransactionTestBase.internalCleanup(TransactionTestBase.java:295)
at
org.apache.pulsar.broker.transaction.buffer.TransactionBufferClientTest.cleanup(TransactionBufferClientTest.java:95)
```
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